Stimulus-responsive gel material

Abstract

A stimulus-responsive gel material includes: a first polymer having an OH group; a second polymer having a phenylboronic acid structure; fine particles having an average particle diameter of 10 nm or more and 1000 nm or less; and a solvent, wherein the material is capable of being put into a first state in which the OH group of the first polymer and the phenylboronic acid structure of the second polymer are bonded to each other, and a second state in which the bond between the OH group of the first polymer and the phenylboronic acid structure of the second polymer is dissociated, and the wavelength of a reflected light from the material is different between the first state and the second state.

What is claimed is: 
     
       1. A stimulus-responsive gel material, comprising:
 a mixture including: 
 a first polymer having an OH group;
 a second polymer having a phenylboronic acid structure; 
 fine particles having an average particle diameter of 10 nm or more and 1000 nm or less; and 
 a solvent, wherein 
 
 the first and second polymers each have a cross-linked structure; 
 the material is capable of being put into the following states:
 a first state in which the OH group of the first polymer and the phenylboronic acid structure of the second polymer are bonded to each other; and 
 a second state in which the bond between the OH group of the first polymer and the phenylboronic acid structure of the second polymer is dissociated, and 
 
 the wavelength of a reflected light from the material is different between the first state and the second state. 
 
     
     
       2. The stimulus-responsive gel material according to  claim 1 , wherein the material is put into the second state by reacting the phenylboronic acid structure of the second polymer and lactic acid with each other. 
     
     
       3. The stimulus-responsive gel material according to  claim 1 , wherein the first polymer contains N-hydroxyethylacrylamide as a constituent component. 
     
     
       4. The stimulus-responsive gel material according to  claim 1 , wherein the second polymer contains a monomer having a phenylboronic acid structure as a constituent component. 
     
     
       5. The stimulus-responsive gel material according to  claim 1 , wherein the second polymer contains 3-acrylamidephenylboronic acid as a constituent component. 
     
     
       6. The stimulus-responsive gel material according to  claim 1 , wherein when the content of the first polymer is denoted by X 1  (mass %) and the content of the second polymer is denoted by X 2  (mass %), X 1  and X 2  satisfy the following relationship: 0.2≦X 2 /X 1 ≦8. 
     
     
       7. The stimulus-responsive gel material according to  claim 1 , wherein water is contained as the solvent. 
     
     
       8. The stimulus-responsive gel material according to  claim 1 , wherein silica is contained as the fine particles. 
     
     
       9. A stimulus-responsive gel material, comprising:
 a mixture including:
 a first polymer having an OH group, the first polymer containing N-hydroxyethylacrylamide as a constituent component; 
 second polymer having a phenylboronic acid structure; 
 fine particles having an average particle diameter of 10 nm or more and 1000 nm or less; and 
 a solvent, wherein 
 
 the material is capable of being put into the following states:
 a first state in which the OH group of the first polymer and the phenylboronic acid structure of the second polymer are bonded to each other; and 
 
 a second state in which the bond between the OH group of the first polymer and the phenylboronic acid structure of the second polymer is dissociated, and 
 the wavelength of a reflected light from the material is different between the first state and the second state. 
 
     
     
       10. A stimulus-responsive gel material, comprising:
 a mixture including:
 a first polymer having an OH group; 
 a second polymer having a phenylboronic acid structure, the second polymer containing 3-acrylamidephenylboronic acid as a constituent component; 
 fine particles having an average particle diameter of 10 nm or more and 1000 nm or less; and 
 a solvent, wherein 
 
 the material is capable of being put into the following states:
 a first state in which the OH group of the first polymer and the phenylboronic acid structure of the second polymer are bonded to each other; and 
 a second state in which the bond between the OH group of the first polymer and the phenylboronic acid structure of the second polymer is dissociated, and 
 
 the wavelength of a reflected light from the material is different between the first state and the second state. 
 
     
     
       11. A stimulus-responsive gel material, comprising:
 a mixture including:
 a first polymer having an OH group; 
 a second polymer having a phenylboronic acid structure; 
 fine particles having an average particle diameter of 10 nm or more and 1000 nm or less; and 
 a solvent, wherein 
 
 the material is capable of being put into the following states:
 a first state in which the OH group of the first polymer and the phenylboronic acid structure of the second polymer are bonded to each other; and 
 a second state in which the bond between the OH group of the first polymer and the phenylboronic acid structure of the second polymer is dissociated, 
 
 the wavelength of a reflected light from the material is different between the first state and the second state, and 
 when the content of the first polymer is denoted by X1 (mass %) and the content of the second polymer is denoted by X2 (mass %), X1 and X2 satisfy the following relationship: 0.2≦X2/X1≦8.